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The Low Frequency Long Stroke Accelerometer Calibration Shaker represent a new level of calibration performance. These 9155D-770 Series exciters offer ultra-low frequency calibrations with the Accelerometer Calibration Workstation Model 9155D. Users can accurately calibrate accelerometers to frequency range as low as 0.1 Hz using the shaker’s 10” (255 mm) stroke.
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The 9155D-771 and 9155D-779 options both utilize a high sensitivity quartz ICP® back-to-back reference accelerometer specifically designed by PCB Piezotronics for low frequency comparison calibration from 0.5 to 500 Hz. The double-ended reference mounts to the long stroke shaker and provides a direct mounting surface for the Sensor Under Test. The quartz sensing element provides superior stability and performance compared to ceramic-based standards and the low impedance ICP® design nearly eliminates errors due to cable motion and signal degradation seen with charge accelerometers, particularly at low frequencies and large displacements.
| 9155D-771 Option | 9155D-779 Option | |
|---|---|---|
| Frequency Range – Hz [1] [2] | 0.5 - 500 | 0.1 - 500 |
| Stroke - in (mm) pk-pk | 10 (255) | |
| Maximum Payload - lb (kg) | 4.4 (2) | |
| Reference Sensor Type | Quartz Shear ICP Accelerometer | Optical Encoder / Quartz Shear ICP Accelerometer |
| Standards Compliance | ISO 16063-21 | |
| Shaker Model | 2129E025 | |
| Full Specifications | View | View |
[1] -771 supplies only the accelerometer reference used from 0.5 to 500 Hz
[2] -779 supplies both the optical reference (0.1 to 10 Hz) and the accelerometer reference (10 to 500 Hz)
| Expanded Measurement Uncertainty [1] | 9155D-771 Option | 9155D-779 Option |
|---|---|---|
| 0.25 - 0.5 Hz | - | 3.0% |
| 0.5 - 1 Hz | 1.5% | 1.1% |
| 1 - 10 Hz | 1.25% | 0.8% |
| 10 - 100 Hz | 1.0% | 1.0% |
[1] Per ISO with k=2 coverage factor using PCB Q353B51. Uncertainty below 0.25 Hz, above 100 Hz, is undefined.
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In addition to the reference accelerometer, the 9155D-779 option utilizes a state-of-the-art optical encoder reference for unparalleled low frequency signal quality and performance. This reference measures displacement instead of acceleration, allowing for optimum performance by eliminating low frequency acceleration limitations due to stroke length. The result is greatly improved low frequency dynamic calibration, extended down to 0.1 Hz. The Accelerometer Calibration Workstation Model 9155D comes with the PCB Piezotronics “Total Customer Satisfaction” guarantee, and features back-to-back comparison calibration for both sensitivity and phase according to ISO 16063-21. measurement.